Demographic characteristics of an adfluvial bull trout population in Lake Pend Oreille, Idaho

North American Journal of Fisheries Management
By: , and 

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Abstract

Introductions of nonnative species, habitat loss, and stream fragmentation have caused the Bull Trout Salvelinus confluentus to decline throughout much of its native distribution. Consequently, in June 1998, the Bull Trout was listed under the U.S. Endangered Species Act as threatened. The Bull Trout has existed in Lake Pend Oreille and its surrounding tributaries since the last ice age, and the lake once supported a world-renowned Bull Trout fishery. To quantify the current status of the Bull Trout population in Lake Pend Oreille, Idaho, we compared the mean age, growth, maturity, and abundance with reports in a study conducted one decade earlier. Abundance was estimated by mark–recapture for Bull Trout caught in trap nets and gill nets set in Lake Pend Oreille during ongoing suppression netting of Lake Trout S. namaycushin 2007–2008. Bull Trout sampled in 2006–2008 were used to estimate age structure, survival, growth, and maturity. Estimated Bull Trout abundance was similar to that estimated one decade earlier in Lake Pend Oreille. Bull Trout residing in Lake Pend Oreille between 2006 and 2008 were between ages 4 and 14 years; their growth was fastest between ages 1 and 2 and slowed thereafter. Male and female Bull Trout matured at a similar age, but females grew faster than males, thereby maturing at a larger size. Our findings suggest that management has effectively addressed current threats to increase the likelihood of long-term persistence of the Bull Trout population in Lake Pend Oreille.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Demographic characteristics of an adfluvial bull trout population in Lake Pend Oreille, Idaho
Series title North American Journal of Fisheries Management
DOI 10.1080/02755947.2016.1209602
Volume 36
Issue 6
Year Published 2016
Language English
Publisher Taylor & Francis
Contributing office(s) Great Lakes Science Center
Description 9 p.
First page 1269
Last page 1277
Country United States
State Idaho
Other Geospatial Lake Pend Oreille
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